- Companies
- Specialist contractors
- Seaham
- Retroflo Limited
Retroflo Limited
- Company number
- 06416550
- Incorporated
- 2 Nov 200718 years trading
- Registered office
- Unit 12 Enterprise Court, Seaham Grange Industrial Estate, Seaham, SR7 0PS
- Nature of business
- Other specialised construction activities n.e.c.
Retroflo Limited is a 18-year-old private limited company registered in Seaham, company number 06416550, one of 11 specialist construction companies in Seaham. Its next accounts are due at Companies House on 31 January 2027, and the CT600 for the period to 30 April 2026 is due at HMRC on 30 April 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
Is this your company?
File the accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for Retroflo LimitedOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
Finances
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets up £723K (+299%) on the year before, to £965K.
- Net assets rose in 7 of 8 year-on-year comparisons on record.
- Current assets of £3.1M against £1.9M owed within a year: 1.6 times cover.
- 47 employees on average, up from 42 the year before.
- Balance sheets on record for 10 years, 2015 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Apr 2025 | £965K | £973K | £3.1M | £1.9M | 47 |
| 30 Apr 2024 | £242K | £741K | £2.4M | £1.3M | 42 |
| 30 Apr 2023 | -£55K | £140K | £1.5M | £575K | 41 |
| 30 Apr 2022 | -£394K | £122K | £1.4M | £837K | 37 |
| 30 Apr 2021 | -£655K | £3,311 | £865K | £658K | 45 |
| 30 Apr 2020 | -£628K | £91K | £974K | £592K | 41 |
| 30 Apr 2019 | -£692K | £25K | £988K | £603K | 41 |
| 30 Apr 2018 | -£894K | £34K | £802K | £600K | 27 |
| 30 Apr 2016 | -£729K | £75K | £514K | £168K | |
| 30 Apr 2015 | -£767K | £175K | £556K | £255K |
Public contracts won
Retroflo Limited has 2 public sector contract awards on record, from 2018 to 2022. Source: Contracts Finder and Find a Tender award notices. For all of them the published figure is a shared or multi-year ceiling (a framework place, a multi-supplier award, or more than a small company could hold alone), so no value is shown. 1 of these were matched by the company's exact name because the notice gave no company number.
Awards by year
Main buyers
- Northumbrian Water Group Limited1 award
- Sunderland City Council1 award
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| Northumbrian Water Group Limited | Low Complexity MEICA Works | Ceiling, not shown | 14 Apr 2022 |
| Sunderland City Council | Building Services Framework | Ceiling, not shown | 12 Mar 2018 |
Where Retroflo Limited is registered
The registered office is in Seaham (SR7), in the County Durham local authority area, North East. Show SR7 0PS on a map.
Other trade companies in SR7
- Northeast Hygiene Solution LtdCleaning companies
- Wraccess LimitedElectricians
- GS Groundworks Ne LtdCivil engineering
- Alloy Wheel Studio LimitedMechanics and garages
- Leewoods Developments LtdProperty developers
- Parker Clarke Group LtdMachinery repair and installation
- Coast 2 Coast Builders LtdBuilders
- Technalight LtdElectricians
What happens if Retroflo Limited files late
Companies House charges an automatic penalty the day after the deadline, and it rises the longer the accounts are late. These are the dates for this company's accounts due on 31 January 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Feb 2027 to 28 Feb 2027 | £150 |
| 1 to 3 months late | 1 Mar 2027 to 30 Apr 2027 | £375 |
| 3 to 6 months late | 1 May 2027 to 31 Jul 2027 | £750 |
| More than 6 months late | From 1 Aug 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 May 2027 | £200 |
| 3 months late | 30 Jul 2027 | another £200 |
| 6 months late | 30 Oct 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Apr 2028 | another 10% of any unpaid tax |
For returns filed on or after 1 April 2026. Late three times in a row and the £200 penalties become £1,000 each.
Company details
As held on the Companies House register.
- Company number
- 06416550
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 2 November 2007 (18 years ago)
- Registered office
- Unit 12 Enterprise Court, Seaham Grange Industrial Estate, Seaham, SR7 0PS
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 30 April (accounting reference date)
- Accounts type
- Unaudited abridged
- Last accounts made up to
- 30 April 2025
- Last confirmation statement
- 19 April 2026
- Charges (mortgages)
- 1 outstanding of 3 registered
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in Seaham
Other active specialist construction companies registered in Seaham.
- SLD Planning Ltd2016
- ST. Astier Limited2003
- Subport (Durham) Limited2024
- Tempest Rope Access Solutions Limited2023
- Buffalo Power Services Limited2003
- Drilcorp Limited1992
- Eleganz Constructions Limited2016
- L.Brunning Inspection Services Ltd2022
All specialist construction companies in Seaham · All trades in Seaham · Specialist contractors across the UK
Frequently asked questions
When are Retroflo Limited's accounts due?
Retroflo Limited's next accounts are due at Companies House by 31 January 2027 (in 111 days), covering the period to 30 April 2026.
When is Retroflo Limited's CT600 due?
The CT600 for the period to 30 April 2026 is due at HMRC by 30 April 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 February 2027.
Is Retroflo Limited still trading?
Retroflo Limited is listed as active on the Companies House register as of 1 Oct 2026. Active means it has not been dissolved or entered insolvency; it does not show whether it is currently taking on work.
What does Retroflo Limited do?
Retroflo Limited is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Retroflo Limited?
Retroflo Limited was incorporated on 2 November 2007, 18 years ago.
Has Retroflo Limited won public sector contracts?
Yes. Retroflo Limited has 2 contract awards from public bodies on Contracts Finder and Find a Tender, most recently from NORTHUMBRIAN WATER GROUP LIMITED.
What is the penalty if Retroflo Limited files its accounts late?
Companies House charges £150 if the accounts are up to 1 month late, £375 up to 3 months, £750 up to 6 months and £1,500 after that, doubled if the previous year's accounts were also late. HMRC charges £200 for a CT600 filed a day late and another £200 at 3 months.
Official records
View Retroflo Limited on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026). Deadlines are worked out from the register and assume a standard accounting period; a change of year end or a short period moves them. This page is general information, not tax or accountancy advice.